Solo Dev · UE5 Plugin · OpenAI API
LLM NPC
Plugin.
A UE5 plugin integrating GPT-driven NPC dialogue with tunable personality profiles and behavioral data assets. NPCs respond dynamically to player input via the OpenAI API — with per-character personality, traits, edge cases, and context windows defined entirely in data assets, keeping all configuration out of code and in the hands of designers.
// primary
C++
Unreal Engine 5
// systems & tools
OpenAI API
Plugin Arch
Data Assets
HTTP Plugin
Blueprint
NPC Design
// project.info
type
UE5 Plugin
engine
Unreal 5
api
OpenAI GPT
status
In Dev
source
GitHub
// systems.overview
01
Personality Data Assets
Each NPC's personality is defined in a UE5 Data Asset — main description,
supporting details, named traits with intensity values, forbidden topics,
conditional edge cases, and default responses. Designers configure
full NPC behavior without touching a line of code.
02
GPT API Integration
Async HTTP requests to the OpenAI API built on UE5's HTTP Plugin.
The data asset is packaged into a readable JSON payload, sent to GPT,
and the streamed response is parsed and output back into the game
at runtime.
03
Context Window Management
Previous conversation context is passed alongside the current input
and data asset on every request — giving NPCs persistent memory
across a dialogue session while staying within API token limits.
04
Blueprint-Accessible Interface
The full plugin interface is exposed to Blueprint — designers can
trigger dialogue, pass player input, and handle NPC responses
without writing C++. Drop in, configure a data asset, and go.
// screenshots
